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Pv system running watts
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ok, so if i only have the pv system on and nothing else the meter socket will act as a measurement device with the appropriate corrections that my Ideal amp probe is not capable of? Meaning it should show no kwh change whatsoever since the pv systems draw should be negligible? will certainly try that.... I am still looking for an explanation of why the 3.14 amps is there though. Like Tom Petty I need to know.Last edited by vino1982; 02-02-2018, 07:04 AM.Comment
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You are measuring a leg to neutral. and then the other leg to neutral.
The meter measures leg to leg.
What some power factor correction devices do is move power quickly form one leg to the other to try to balances things so the power company meter shows zero but your measuring devices are too slow to see the back and forth and are only measuring half of it at time.
I had a very similar testing situation with Satic USA which is making claims that Solar inverters create dirty power and that their Satic power perfect box saves 15% on utility bills. The box just moves power back and forth from one leg to the other. It does seem to balance the legs slightly and confuses amp meters unless you measure both legs which I do with a TEDPro. In any case Satic still makes their claims ( they have been for decades so I wasn't going to stop them) but we never made the same claims for their snake oil.
when you do the test you should have EVERY other breaker in the house off, including internet, fridge, etc.Last edited by ButchDeal; 02-02-2018, 09:05 AM.OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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The Ted Pro monitors voltage along with amperage and can compensate for power factor.
As I mentioned Voltage is NOT constant.
The voltage is important when looking at kwh as watts = amps X Volts X PF (Power Factor)
so just looking at the voltage variance you can see your problem right?
here is the variance on my home just today: high of 121.4V low of 112.2V (ignoring PF)
so a 3amp reading at 112.2V would mean a wattage of 336.6w
Where a 3 amp reading at 121.4V would be 364.2w
a 27.6w difference
I have seen much bigger swings in different locations around the country.
If you look at the average column (average of two months of Fridays) you can see a high of 126V and low of 109V for a 136watt swing at 3 amps
NOTE the $ amounts are not accurate as I never set our kwh costs
You can see the pvoutput from my TEDPro here https://pvoutput.org/intraday.jsp?id=31117&sid=29881 TED_Commander.jpg
Last edited by ButchDeal; 02-02-2018, 11:03 AM.OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNHComment
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the "power" you see is reactive power - each Micro inverter (those are still transformer basis) have a big LC embedded - the V*A is out of phase and does not count as "real" power -
each "enphase" draw approx. 100mA reactive power - so your number seems right (240*0.1*30)
I bet the utility meter is the golden one that count -Comment
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the "power" you see is reactive power - each Micro inverter (those are still transformer basis) have a big LC embedded - the V*A is out of phase and does not count as "real" power -
each "enphase" draw approx. 100mA reactive power - so your number seems right (240*0.1*30)
I bet the utility meter is the golden one that count -Last edited by DanS26; 02-05-2018, 12:31 PM.Comment
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Last edited by DanS26; 02-05-2018, 07:00 PM.Comment
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@vino1982 Quick question. I also have eyedro on my system. During the night I always see the generation showing 135w which is wrong do you also get this. Thanks
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